linux-kernel - Re: [patch 1/2] [PATCH] mm: Save soft-dirty bits on swapped pages

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Date:	Thu, 8 Aug 2013 00:29:14 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	luto@...capital.net, xemul@...allels.com, mpm@...enic.com,
	xiaoguangrong@...ux.vnet.ibm.com, mtosatti@...hat.com,
	kosaki.motohiro@...il.com, sfr@...b.auug.org.au,
	peterz@...radead.org, aneesh.kumar@...ux.vnet.ibm.com
Subject: Re: [patch 1/2] [PATCH] mm: Save soft-dirty bits on swapped pages

On Wed, Aug 07, 2013 at 01:21:56PM -0700, Andrew Morton wrote:
> > 
> > One of the problem was to find a place in pte entry where we can
> > save the _PTE_SWP_SOFT_DIRTY bit while page is in swap. The
> > _PAGE_PSE was chosen for that, it doesn't intersect with swap
> > entry format stored in pte.
> 
> So the implication is that if another architecture wants to support
> this (and, realistically, wants to support CRIU), that architecture
> must find a spare pte bit to implement _PTE_SWP_SOFT_DIRTY.  Yes?

Exactly.
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